Otto j



0.1. KUENHOLD.

.AUXILIARY HEATER FOR FURNACES.

APPLICATION HLED'MAY 6,1918.

1,375,848, Patented Apr. 26, 1921.

Fly. 1.

a gas furnace.

UNITED STATES PATENT OFFICE.

OTTO J. KUENHOLD, OF CLEVELAND, OHIO, ASSIGNOR TO THE SCIENTIFIC HEATER COMPANY, OF CLEVELAND,

OHIO, A CORPORATION OF OHIO.

AUXILIARY HEATER FOR FURNACES.

Specification of Letters Patent.

Patented Apr. 26, 1921.

Application filed May 6, 1918. Serial No. 232,773;

State ofl Ohio, have invented certain new and useful Improvements 1n Auxlllary Heaters for Furnaces, of which the following is a specification.

This invention relates to heatlng devlces, and more particularly to what are known as auxiliary heaters. The Ob ect of the in vention is to provide an auxillary heater for use in connection with a furnace and which can be selectively thrown 1Ilt0 and out of operation so as to secure mcreased heating effect whenever desired. Moreparticularly the object of the lnventlon 1s to provide an auxiliary heater of the klnd described which is of simple construction, which can be readily attached in varlous ways to an ordinary furnace either when first built or after installation, wh1ch can be readily controlled or manipulated, and which materially increases the efficiency of the furnace and secures increased heating results at lower cost.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the drawings, which illustrate one suitable embodiment of the invention, Figure 1 is a sectional elevation, from front to rear,

through the furnace and auxiliary heater;

comprises a heater A to which is connected an auxiliary heater B. The furnace A may be of any suitable type or description, but is usually either an ordinary coal furnace, a coal furnace modified for gaseous fuel, or The furnace illustrated is an" ordinary coal furnace comprising an outer casing or jacket 1 provided with a lower air inlet 2 and upper outlet pipes 3 for directing the heated air to the place of use. In the air chamber 4 of said casing 1s the usual stove or heater, including the fire pot 5, a grate 6 and an ash pit 7 The products of combustion from said stove are conducted in any suitable manner, such as by the plpe 8, to the usual heating member or radlator, such as the annular drum 9, from which they travel by way of the smoke plpe 10 at the back of the furnace to the stack.

The auxiliary heater B includes an outer casing or jacket 13 resting upon the floor or suitable supports 14. Said casing is provided with an inner air chamber 15 to which air is admitted through a suitable opening located near the bottom of the auxiliary directly by way of a plpe or pipes 19 connected to the upper portion of the casing 13, as shown in Fig. 4, or the upper portion of the chamber 15' may communicate by way of a conduit 20 with the chamber 4 of the furnace. The first arrangement enables the furnace and auxiliary heater to be separated from each other by a considerable distance, some rooms being heated by the fur-. nace and some by the auxiliary heater, while in the second arrangement the heated air from the auxiliary heater is deflected into the furnace around the drum 9 so as to contact with a large area thereof and therefore absorbs a maximum amount of heat before distribution through the pipes 3.

Within the air chamber 15 are located one or more hollow heating tubes or radiating members 21, four of saidmembers being shown for purposes of illustration. Said members are of large area and are spaced from each other and from the walls of the jacket 13 so as to provide a plurality of .80 conducted to the place to be heated, either i said members are connected at their upper and lower ends by short necks 25. Suitable means is provided for conducting the products of combustion from the furnace either directly to the staclr or through the members 21, as desired, said means being also arranged to provide for installation of the auxiliary heater in various ways. 7

The two headers 23, 2% both xtend at both ends outwardly beyond the casing 13, to, enable connections to be made to either end-of said headers, as may be required. To the central portion of the upper header 23 is also connected a pipe 26 which is smaller than the conduit 20 and extends thereinto. This enables the pipe 10 to be connected to said pipe 26 when using the conduit 20, as shown in Fig. 3, the auxiliary heater being directly behind tl e furnace and discharging its heated air thereinto. When the hot air is taken directly from the auxiliar heater to the place to be heated by means of pipes 19 the conduit 20 is either i closed up or omitted, as in Fig. hand pipe 26 extends directly through the wall of casing 13.

' Suitable connections are made to the smoke stack from one side'oi' the auxiliary heater. The construction described enables these connections to be made at either side as may be most convenient. The drawings show theconnections at the right in Fig. 2, the opposite ends of the headers 23, 24 being closed by suitable caps or covers 27 Upper header 23 is provided with a T 28 one branch of which, that connected to header 23, is provided with a close fitting damper 29. Another branch 30 is provided with an ordinary damper 31 and communicates by a pipe 32 with the lower header 2 1, while the other branch 33 leads to the stack. The T may be turned to the position shown in dotted lines, Fig. 2, when such an arrange1 ment is more convenient for reaching the stack. In such case the two dampers 29 and 31 are interchanged.

When an obstruction, such as indicated at 3 1, Fig. 5, prevents locating the auxiliary heater directly in the rear of the furnace and opposite the smoke pipe 10, said smoke pipe may be connected by a bent elbow35 to one of the ends oi": the upper header 23, and the connection to the staclr from said header is at its opposite end.

The furnace may be used'in the ordinary manner, for example, as an ordinary coal furnace, without resorting to use or the auxiliary heater. This effect is secured by opening the damper 29, inwhich case the products of combination. from the main furnace flow through pipe 10 to the upper header 23 and thence through the T 28 to the stack without traversing the auxiliary radiators. Door 16 is also closed, it desired. When additional heating effect is desired,

cure the best effects irom the available either when using coal or gas in the main i'urnace, the damper 29 is closed, as shown in Fig. 2, which obstructs the flow of the heated products of combustion from the upper header directly to the stack and causes the hot gases to be diverted downwardly through the members 21 to the lower header 24L and thence by way of pipe 32 and T 28 to the stack, the damper 31 bein used as the ordinary regulating damper. lit the same time the door 16 is raised more or less, as desired, in order to allow air to flow around the radiators and thence either to the chamber 1 in Fig. 3, or to the pipes 19 in 4. As a consequence the members 21 give up their heat to the rising current of air in chamber 15. The incoming cold air strikes the lower colder portions of the members 21 and rises along said members 21 to their hotter portions. The opposite directions of travelof the two currents therefore progressively heat the cold air to maximum temperature and secures the most efficient heat interchange.

The auxiliary heater may be used While burning either coal or gas in thefurnace, but is usually used while burning gas and is therefore particularly desirable for use when the supply of gas is low, so as to sesupply.

The elbow 36 at the lower end of the pipe 32 is preferably provided with a removable drain out-let closure 37 and by setting the auxiliary heater with a small slant owa d 6 said outlet, any moisture or water of condensation which might collect is readily drained oil, thereby avoiding possibility of rust. This outlet, if desired, may be adapted for a pipe connection, as shown. caps 27 are removable to serve as clean out doors for the headers, and, preferably each of the members 21 is provided at its lower rear corner with a suitable clean out door 38 accessible through the opening closed by the door 16. This construction enables the heater to be readily cleaned when desired.

The heater described is of simple construction, is so arranged as to be readily attacha-ble in the most efficient position to any furnace, regardless of near by obstructions or limitations of space, is conveniently manipulated and is also not likely to get out of order in service.

What I claim is:

1. A self-contained auxiliary heater for use withfurnaces, comprising an outer casing having an air inlet and an air outlet, upper and lower headers therein, and a series of tubes connecting said headers, said headers at both ends being of full size and said full sized portion extending beyond the walls of said casing.

2. A self-contained auxiliary heater for use with furnaces, comprising an outer cas- The 1 0 5- ing having an air inlet and an air outlet, upper and lower headers therein, and a series of radiators connecting said headers, the upper header being openable at either end and having a lateral branch and thereby being adapted at three different places for connection of a smoke pipe thereto.

3. A self-contained auxiliary heater for use with furnaces, comprising an outer casing having an air inlet and an air outlet, upper and lower headers therein, and a series of tubes connecting said headers, said tubes being provided With cleanout doors accessible through an air opening of the outer casing.

In testimony whereof I aflix my signature.

OTTO J. KUENHOLD. 

